1. N.R.C, Biotechnology Research Institute, Montreal, Québec, H4P 2R2, Canada
2. N.R.C.C. Paper N° 32772
3. Université de Technologie, Département. de Génie Chimique, 60206 Compiègne, France
4. University of Calgary, Department of Biological Sciences, Calgary, Alberta, T2N 1N4, Canada